Users receive the following error message when accessing the Defender Management Portal:
"Sorry, Defender was unable to register your token. Please try again later."
Confirm the service account used for the Defender Management Portal has sufficient permissions in Active Directory.
The permissions required for the service account can be delegated using the Delegate Control wizard from the Defender Administration Console.
For more information see the Defender Token Deployment System Quick Start Guide:
As well as the Delegated Administration User Guide: